' behalf, but nothing in the document says that mental illness will be used as a defense. and, scott, a lot of information still not out there because they have not released a number of the documents. >> pelley: barry, thank you. police in massachusetts today arrested a crime lab scientist and accused her of faking thousands of tests that may have put innocent people behind bars. elaine quijano is following the story in boston tonight. >> reporter: annie dookhan was arrested at her home outside boston. police say the former state crime lab chemist admitted that she altered or faked test results of drug cases assigned to her. prosecutors say she went as far as adding cocaine to samples that were negative. state attorney general martha coakley. >> there was clearly a short cutting of corners. there was just getting this done as quickly as possible and all of that we're still looking at. >> reporter: officials say during her nine years at the lab dookhan tested more than 60,000 drug samples. 1,100 people now in jail were put there in part due to her work. already more than a